The reason he hasn’t e is .
A. that; because he is ill
B. that; because of his illness
C. why; for he is ill
D. why; that he is ill
网友回答
A. that; because he is ill
B. that; because of his illness
C. why; for he is ill
(答案→)D. why; that he is ill
解析： he hasn’t e是定语从句，先行词The reason在定从中作原因状语，用why引导；is后是表语从句，不能用for引导，所以选D。